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View Full Version : reduce acceleration, hard acceleration may damage catalyser


markwarren
09-28-2012, 03:27 AM
hi all, just had the message

reduce acceleration, hard acceleration may damage catalyser. Any ideas what the problem is. The car is a 2002 745i with 80k on it.

i did have a mis-fire a few weeks ago but stopped the engine and turned it back on again and it was fine?

any ideas?

745iguy
09-28-2012, 07:09 AM
Have you checked to make sure all the coils are plugged in? have you recently change the spark plugs? do you have access to a OBD code reader?
If the first two arent true, if you can get to an OBD get the codes read out, find out what cylinder the misfire is, take the coil out and swap it with another cylinder's coil, if the code moves to the cylinder the coil was moved to then the coil is bad, if not check the spark plug in that cylinder and wire connections to the cylinder. matter of fact no matter what always make sure the coil is seated properly and that the plug into the coil is seated properly just incase you move the coil and then the code moves.

markwarren
09-28-2012, 07:17 AM
thanks for that mate, I had a similar issue some years ago with an audi s8 but as the 745 is a lot more technical i wanted to check. Dont have any electronics to test but I will get a mechanic to check the plugs next week. I did have the rocker cover gaskets changed a few weeks ago so that might have disturbed something!

chrisrees
09-28-2012, 12:04 PM
Coils

chrisrees
09-28-2012, 12:07 PM
hi all, just had the message

reduce acceleration, hard acceleration may damage catalyser. Any ideas what the problem is. The car is a 2002 745i with 80k on it.

i did have a mis-fire a few weeks ago but stopped the engine and turned it back on again and it was fine?

any ideas?

And now the real repairs begin at 80,000 miles.

scellpt
11-22-2013, 10:46 AM
had that message this morning will wait to see if it comes back it was very cold dont no if this caused it.

scellpt
01-20-2014, 01:52 AM
Yes it still happens and now more frequently but only when cold . Now every morning the check engine light comes on together with the message. But it goes off in 1 or 2 minutes. However a week ago the check engine light stayed on . For days until I used my machine and cleared the codes however the code reader said number 5 cylinder misfire. So cold ain't check nothing yet . So when I get a break in a week or so I will report back.

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scellpt
02-06-2014, 09:37 AM
Today I checked the coil still saying misfire cylinder 5 after I swap the coil with number 6 . I notice that number 6 had oil in the plug holes that was rotting out the rubber on the coil pack so I just did my best to clean it up and put back together . I work early so it will be cold in the morning so will c if any changes.
In the mean time any suggestions

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SKL.Carlos
12-21-2014, 07:37 AM
please let me know if you fixed the misfire problem. i've chanced all the coil sparks but after 2 weeks the error comes back.

scellpt
12-21-2014, 07:51 AM
Still have the issues

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markwarren
12-22-2014, 12:11 AM
Thanks everyone, the problem is fixed. When we lifted the passengers front carpet we noticed it was wet. We checked all drain holes and they were clear (even the ones under the bonnet). In the end it was the water hitting the electrics under the passenger floor, we replaced the windscreen and hey presto, never happened again!

scellpt
12-22-2014, 01:55 AM
You are saying that the problem is related to wet electronics under passenger front seat

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scellpt
12-22-2014, 01:57 AM
And also the only time I get my warning is wen it's very cold and freezing outside . I haven't had it for months but now it's winter again in England and it's back ever so often .

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markwarren
12-22-2014, 02:10 AM
yes once the carpet and below was dry the problem went away.

prior to that though i did change the coil packs around after resetting the faults to see if the misfire went from pot 8 to 1 and it didnt.

scellpt
12-22-2014, 03:13 AM
How much work to get under the carpet once that seat is removed

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markwarren
12-22-2014, 03:22 AM
we didnt need to remove tthe seat, we were able to pull the carpet back from the foot well and put in a heater for an hour. we were fortunate that it was summer too. Is your carpet wet?

scellpt
12-22-2014, 04:33 AM
Will have to check and update you

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